Why does HTML think “chucknorris” is a color?

It has something to do with the way IE parses colors in HTML, and treats missing digits.

There's a pretty interesting blog post about it here: http://scrappy-do.blogspot.co.uk/2004/08/little-rant-about-microsoft-internet.html

Essentially, "Chuck Norris" isn't the only word that returns a color value.